To increase the amount of damage Anger does, open battleupdate.php and alter the two values of $anger.
But mind you, the amount of damage it does increases fast as hell, so don't think 10 is a fitting value

(This will cause about 22k damage, last I checked

)
An upcoming feature is my very own Level Based Limit Break addon, which will increase anger damage based on Final Fantasy 7 style (for those that dunno this, look it up :P) Limit Breaks.
I see since your an FF8 fan, Dor, you probs know what Im talking about